* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    list-style: none;
    text-decoration: none;
    font-family: "宋体";
    font-weight: bold;
    box-sizing: border-box;
}

ul {
    overflow: hidden;
}

ul li {
    float: left;
    width: 200px;
    height: 30px;
    line-height: 30px;
    border: 1px solid palevioletred;
    text-align: center;
}

h2 {
    text-align: center;
}

.biger {
    width: 1400px;
    margin: 0 auto;
}

.btn1,
.btn2 
{
    width: 100px;
    height: 30px;
    margin: 0 auto;
    display: block;
    cursor: pointer;
    margin-top: 20px;
    background-color: plum;
    border: 2px solid palevioletred;
    border-radius: 5px;
    color: #fff;
    font-weight: bold;
}

.add_big {
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background-color: rgba(0, 0, 0, 0.3);
    display: none;
}

.add_biger {
    width: 420px;
    height: 480px;
    top: 50%;
    left: 50%;
    margin-top: -150px;
    margin-left: -200px;
    position: absolute;
    background-color: pink;
    border-radius: 10px;
    opacity: 0.7;
    border: 2px solid #000;
}

.add_biger div {
    margin-top: 40px;
    margin-left: 50px;
}

input {
    border-radius: 5px;
    outline: none;
    padding-left: 10px;
}

input::-webkit-input-placeholder {
    font-size: 12px;
}

select {
    border-radius: 5px;
}

span {
    font-size: 12px;
    color: red;
}
.error{
    color: #000;
    font-size: 30px;
    float: right;
}